<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
       <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
       <meta name="viewport" content="width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0">    
       <title>.</title>
       <style type="text/css">
         .layer1{width:100%; height:100px;background:blue;color:white;text-align:center;}
		   .layer1-1{width:100%; height:65px;background:#F00;color:white;text-align:center;font-size: 1.5em;}
		   .layer1-2{width:100%; height:35px;background:#9FF;color:white;text-align:center;font-size: 1.5em;}
         .layer2{width:100%; height:400px;color:blue;text-align:center;}
		   .layer2-1{width:60%;height:400px;color:blue;text-align:center;float:left;background:#63F;font-size: 1.5em;}
		   .layer2-2{width:40%;height:400px;color:blue;text-align:center;float:left;background:#9F0;font-size: 1.5em;}
         .layer3{width:100%; height:100px;background:blue;color:white;text-align:center;}  
		  @media screen and (min-width: 900px) and (max-width: 1200px)      
       </style>
    </head>
    <body>
       <div class="layer1">
       <div class="layer1-1"></div>
       <div class="layer1-2"></div>
       </div>
       <div class="layer2">
       <div class="layer2-1"></div>
       <div class="layer2-2"></div>
       </div>    
       <div class="layer3"></div>
    </body>
 </html>
 
